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In page Nile:

"

To the ancient Greeks and Romans, the upper reaches of the White Nile remained largely unknown, as they failed to penetrate the Sudd wetlands of South Sudan. Vitruvius thought that source of the Nile was in Mauritania, on the "other" (south) side of the Atlas Mountains.[2] Various expeditions failed to determine the river's source. Agatharchides records that in the time of Ptolemy II Philadelphus, a military expedition had penetrated far enough along the course of the Blue Nile to determine that the summer floods were caused by heavy seasonal rainstorms in the Ethiopian Highlands, but no European of antiquity is known to have reached Lake Tana. The Tabula Rogeriana depicted the source as three lakes in 1154.[citation needed]